Sadist Khan, unlawful jijadist mayor of London stole the election from the London people.
Sadist Khan is a terrorist supporter and defender, thus himself a pervert terrorist.
Sadist Khan is an enemy combatant for his allegiance to ISIS and Islamic Terror.
ASDA, a popular supermarket chain in once great Britain, is pulling all single kitchen knives off the shelves. Knife crime prevention. Demonic insanity.
Are we banning all Toyota trucks because ISIS paraded around on them, committing horrendous crimes against humanity under Obama's satanic leadership?

No ban does anything to prevent anything.
However, holding Sadist Khan, Fascist Commie Chancellor Merkel and their ilk accountable, that will reduce crime by large margins.

Also note that Sadist Khan, Merkel and the rest of the self-elected/appointed Euro-Elite Trash have introduced laws that PENALIZE the very act of self-defense. The only legal means in Eurostan to defend oneself against crime is a 'rape alarm'.

These laws are a crime in and of itself. No Merkel Sozi, no Islamic Sadist, no one has the right to make laws preventing a human being to defend one's life, family, property.

Khan, May, Merkel and the rest of you demons, you have no authority nor lawful right to rule on behalf of anyone. Perhaps only Satan.